微软收集一周的出租车时空轨迹数据：为了方便大家下载时空轨迹数据进行科研实验，文中提供了一个下载的途径，其数据的格式：taxiid, datetime,longitude,latitude（车辆id,时间，经度，维度）
数据demo：
1, 2008-02-02 15:36:08, 116.51172, 39.92123
1,2008-02-02 15:46:08,116.51135,39.93883
数据：
This is a sample of T-Drive taxi trajectory dataset which was generated by over 10,000 taxis in a period of one week in Beijing.
下载方法：
1在百度里检索T-Drive Trajectory data sample
2打开T-Drive trajectory data sample - Microsoft Research的连接
http://research.microsoft.com/apps/pubs/?id=152883
3进入打开的页面下载轨迹数据
下载页面
相关轨迹数据下载：
http://research.microsoft.com/en-us/people/yuzheng/default.aspx
geolife数据：
http://research.microsoft.com/en-us/downloads/b16d359d-d164-469e-9fd4-daa38f2b2e13/
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